′�?, that has a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, as opposed to the residual absorption peak. Density practical idea computations present the residual absorption on the BGSe https://baga4se7-crystal43963.csublogs.com/39436460/the-smart-trick-of-baga4se7-crystal-that-nobody-is-discussing